Chinese toys

[homefire]

There is a video on Youtube showing how. It seems you just solder a wire on bottom of board bypassing a resistor/cap.

[kt315]

i see tracing and the joint between line on stabilizator and line on trimmer that tuned preset voltage level.
no magic here. i learned some listings and there are pics of the board with more better resolution.

[RH-Lightning]

I've bought this kit:
http://www.ebay.com/itm/DSO138-2-4-T...sAAOSwMNxXXoHJ

but with SMD unsoldered and without case. homepage states that these are fake, not original some chinese ripping off other chinese.
it is noisy, but usable.

[homefire]

At BangGood the ones with the SMD soldered are cheaper then the Un Soldered. LOL The case is only like $5.00 but you would be better off coming up with something else. One Drop and it's over.

[RH-Lightning]

yes, they are cheaper now. I bought the original couple of years ago and it was available only in usoldered version.

[kt315]

bought this tester kit http://www.ebay.com/itm/111990329664

just received it LOL! a board is perfect... esspecially right silk graphics. no schematic there been put, no part list and this is bad.
first thing i did i run by superglue on edge slits of a display. just cause i have bad experience with TFTs that its are not so good sealed at edges in layers.
i killed two TFTs by flux and sealent.

[kt315]

SMDs... will solder them first.
http://ipic.su/img/img7/fs/CIMG6041.1488555736.jpg

[homefire]

I think you may find Schematic and Assembly on line.

[kt315]

soldered. ready to check

[kt315]

bought this tester kit http://www.ebay.com/itm/111990329664

working nice. a 1W LED in socket.

[kt315]

bought this kit. would like to probe how it works or no.
http://www.ebay.com/itm/BJT-Transist...EAAOSwstxU4XcQ

kit arrived. looking good.

[homefire]

It's for checking Linearity of Transistors ?

[kt315]

It's for checking Linearity of Transistors ?

yup. it's the curve tracer and i hope to get the pics on o-scope. the pcb had soldered, ended. i make a power supply, need bipolar voltage, +15V and -15V.
i try to fix Pro Series 9001 power audio amplifier on my job and need to select the power transistors. BTW made in USA device.

[homefire]

Received the DSO150 kit the other day. Funky you have to work on the main PCB with the TFE Flopping around. Instructions tell you as step one to power the main board up before step 2 thru 7 putting components in place. LOL. No time to mess with it . Working on the Car. .,,..Hope I didn't mess up the LCD before finding out it flops.

HF

[kt315]

Battery Tester Circuit


[ATTACH]38832[/ATTACH]
[ATTACH]38833[/ATTACH]

With some luck you can draw some schematic from it and built it.
(btw. kt315, I did not follow any of your advices for these pix
the pictures were taken inside a room, macro-mode & flashlight)


LEDs shining red -> yellow -> green

2,4v red weak
3,6v red medium
4,8v red medium, yellow weak
6v red medium, yellow bright
7,2v red medium, yellow bright, green weak
8,4v red medium, yellow bright, green medium

The connection through the diode was connected with the device
and the push-button doesn't interrupts it. This is good because
batteries which are providing just some mA for LEDs look "full"
while reality might be totally different if they have to "work"
(when they have to provide something like 100 or 200 mA).

i bought and got http://www.ebay.com/itm/201390527682